Samuel l



tS. L. DAVIS. Tube CutterV or Trimmer,

No. 217.347. 'Patented July 8,1879.

#fiest Vez/tor UNITED STATEsPA'rnNT Orrrcn.-

SAMUEL L. DAVlS, OFCANTON, OHI, ASSIGNOR OF ONE-HALF HIS RIGHT ATO C. AULTMAN St CO., QF SAME PLACE.

IMPROVEMENT IN TUBECUTTERS OR TRIMMERS.

Specification forming part of Letters Patent No. 217,347, dated July 8, 1879; application filed January 18, 1879.

of Ohio, have invented a new and useful rlube, Gutter or Trimmer; and l do hereby declare the following to be a full, clear, and exact` description of the same, which will enable others skilled in the art to make and use it,l

reference being had to the accom panyingdrawings, forming part of this specification, in

which- Figure 1 is ay longitudinal section of my improved tube-cutter applied to a tube, which` is also shown partly in section. Fig. 2 is a side elevation of thecutter with the case and cap which receives the tube removed. Fig. 3 is a front elevation of the cutters and their eX- panding-wedge.

Similar letters of reference denote similar parts.

My invention is designed to provide a simple and effective, tool for cutting or trimming boiler and other tubes before they are applied j to use without bending or otherwise injuring their cut ends, and to this end it consists, rst, in a series of segmental cutters arranged within a casefand adapted to be inserted in the tube to be eut, and forced outward to sever its end, combined with a cap around the critters, in which the tube is held while being cut and after the cutting is completed, and which also forms an anvil, along which the cutters move with a shearing cut, and thereby avoid the formation of a burr on the end ofthe cut tube.

It also consists' in constructing the cutterarms with beveled joints outside the critters, to operate in connection with the inclosingcap which receives the tube to be cut, for the purpose of cutting a tube whose sides differ in thickness, and to simultaneously cut the tube and open its end for the reception of the tube-expander which is to be afterward. applied.

It also consists in adapting the cap for adjustment on the inclosing-case of the cutters, for the purpose of adjusting the bearing-edge of the cap with respect to the edges of the cutters.

It also consists in thecombination of one or metal head, C.Y The free cud of each arm I is formed with a segmental steel cutter, D,

and when the arms are all contracted by a steel or other elastic ring, placed around them, the centers of the cutters come together, or nearly so.

In Fig. 3 l have shown four cutters of quadrant shape, their' inner angles being cut o'to form an opening for the point of tihe conical wedge or mandrel. When held together, as shown, the vouter edges of the cutters form a circle, and are in position to be inserted into a tube.

The points F of the arms project beyond the cutters, and are beveled off concentric with the edges thereof.

G is the cylindrical case inclosing the cutter-arms, and itted to the head C by being slipped over the shoulder formed by the ears to which the arms are pivoted. The outer end of the case extends nearly tothe line of the cutters, and is provided with an exterior screw thread to receive a cap, H, having :a circular center opening to receive the end of the tube to be trimmed, and through which the cutterarms project into the tube. The cap should be adjusted upon the case so that `the edges of the cutters when expanded shall just clear the inner edge of the opening in the cap, and thereby form a shearing cut. The edges of the opening, therefore, form a head. or anvil to sustain the tube while being severed.

One or more loose washer-rings, I, inserted between the cap and the edge of the case, serve to arrest the inward movement ofthe cap at the proper point for registering the cutters with the edge of the central opening in the cap, thereby insuring a proper support for the latter, preventing it from being casually turned or moved inward too far, and also preventing the screw threads on the cap and case from being broken when the device is in use.

The operation of' trimming a tube is as follows: The endof the tube is inserted the required distance within the central opening` in the cap, the .cutters at the same time entering the tube, as shown in Fig. 1. The expandingwedge, J which may be square, circular, or of ofher form in cross section, is then passed through the central opening in the head C and driven inward between the cutters, causing the latter to move radially outward and sever the tube flush with 'the inner edge of' the cap.

inasmuch as the cutters separate from each other as they move outward, spaces will be left in the tube uncut in the line of such separation, and to cut these spaces the wedge is withdrawn slightly, the cutters partly turned in the tube, and again forced outward to complete the cut.

It will thus b e seen that the tube will be severed with a clean shearing cut, which prevents the formation of a burr ou the main portion, while the same is properly supported and prevented from being pressed out of'shape.

If the tube should be thicker on one side than ou the other, the cutters will sever the thinnest side first, and then cease to move, while those acting upon the thickest side will continue their motion until the metal is cut through. This is due to the independent action of the cutters, and to the fact that their outwai d movement is only arrested after they have passed entirely through the tube and their points F brought in contact with the interior thereof. The inclination given to the outer surface of these points bevels the end of the tube slightly outward when the cutis completed, and thus opens it for the reception ot'a tube-expander.

It' for any reason the cutters are to be rcmoved and a new set applied to the head, the loose washer-rin gs can be changed or adjusted to insure the proper registering ot' the cutters and cap when the latter is adjusted.

Having thus described my invention, what I claim is- In a tube cutter or trimmer consisting of a series of segmental cutters adapted to operate radially outward from the interior of the tube to be cut, the combination ot' such cutters with a surrounding case and an inclosing head or anvil, H, forming a detachable part of the tool, against which the exterior of the tube is held while and after being cut, and along the edge of which the cutters are moved outward with a shearing' cut, substantially as described, for the purpose specified.

2. In an inside tube-cutter, the combination of the beveled points F with the independent segmental cutters and the cap H, having a central opening and forming part of the tool, substantially as described, for the purpose specified.

3. The adjustable cap H, combined with the case G, for the purpose ot' registering the inner edge ofthe cap-openin g with the edges of the cutters, substantially as described.

4. The combination of one or more loose washer-rings, I, with the adjustable cap, the inclosing-case, and the cutters, substantially as described, for the purpose specified.

5. The combination of the head C, pivoted cutter-arms A, the cutters D, having beveled points F, the case G, adjustable cap H, and washer-ring I, the cutters being adapted for expansion by the wedge J, substantially as described, for the purpose specified.

In testimony of which invention I have hereunto set my hand.

SAMUEL L. DAVIS. Witnesses:

OHAs. J. GATsHALL, M. B. COX. 

